System and method for selecting a destination number upon receiving a dialed number from a calling party

ABSTRACT

A method and system are provided for selecting a destination number upon receiving a dialed number from a calling party. The preferred embodiments include a telecommunications system that, after receiving a dialed number from a calling party, selects a particular destination number and routes the call to that number. In one preferred embodiment, information about the calling party&#39;s end office, such as an originating point code, is used to select a destination number. In another preferred embodiment, destination numbers are stored in a plurality of database locations in the system, and the zip code of the calling party is used to select the appropriate database to query for the destination number. Since the database location selection is independent of the dialed number, the system—not the number dialed by the calling party—determines the appropriate database location to query. These preferred embodiments can be used in a variety of situations and find particular use in a non-emergency service environment.

This is a Continuation Application of U.S application Ser. No. 09/132,164, filed on Aug. 10, 1998, the contents of which are expressly incorporated by reference herein in it's entirety.

TECHNICAL FIELD

The present invention relates generally to call processing in telecommunications networks and specifically to a system and method for selecting a destination number upon receiving a dialed number from a calling party.

BACKGROUND

There have been several attempts to create a telecommunications environment in which a calling party dials a single number and the telecommunications network selects a specific destination number to which the call will be routed. The 911 emergency service is one example. When a calling party dials 911, the end office associated with the calling party translates the dialed digits into a number associated with a private network point and then routes the call to that point. In another service, and end office translates a received dialed number into an 800 number, which is then routed as a standard 800-number call. One disadvantage to this approach is that since all calls to a particular end office are translated into a single 800 number, the end office can only service a single customer.

In contrast to the switch-based systems described above, some telecommunication systems place the translation logic further away from the switch to allow a single database to serve a plurality of end offices. One such service is the Prime Number service offered by Ameritech Corporation. This service offers many advantages to businesses having several locations(e.g., a multi-location pizza restaurant). With this service, a calling party dials a number that is unique to the business, and a database location associated with that number is queried with the calling party's zip code to determine a destination number of one of the business's many locations. The call is then routed to that destination number. Each business that subscribes to this service is assigned a unique phone number, which is associated with a unique database location in the system correlating zip codes with one of the business's several locations. For example, when a calling party dials the number for Art's Pizza, that database location containing zip code/destination number information for Art's Pizza will be queried, whereas if the calling party dials the number for George's Pizza, the database location containing zip code/destination number information for George's Pizza will be queried.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an illustration of a telephone that can be used with the presently preferred embodiments.

FIG. 2 is a block diagram of a telecommunications system of a preferred embodiment.

FIG. 3 is a flow chart of a method of a preferred embodiment using the telecommunications system of FIG. 2.

FIG. 4 is a block diagram of a telecommunications system of another preferred embodiment.

FIG. 5 is an illustration of a preferred database that can be used in the telecommunications system of FIG. 4.

FIG. 6 is a flow chart of a method of a preferred embodiment using the telecommunications system of FIG. 4.

FIG. 7 is an illustration of a preferred database that can be used in the telecommunications system of FIG. 4.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

By way of introduction, the preferred embodiments described below include a telecommunications system that, after receiving a dialed number from a calling party, selects a particular destination number and routes the call to that number. In one preferred embodiment, information about the calling party's end office, such as an originating point code, is used to select a destination number. In another preferred embodiment, destination numbers are stored in a plurality of database locations in the system, and the zip code of the calling party is used to select the appropriate database to query for the destination number. Since the database location selection is independent of the dialed number, the system—not the number dialed by the calling party—determines the appropriate database location to query. This service is more universal than the services described above that use the calling party's zip code since there is less reliance on the dialed number. That is, instead of remembering the numbers associated with each available database location (i.e., each business), a calling party need only remember a single number, and the system selects the particular database location that is to be searched. These preferred embodiments can be used in a variety of situations and find particular use in a non-emergency service environment.

Turning now to the drawings, FIG. 1 is an illustration of a telephone 100 that can be used with the presently preferred embodiments described below. FIG. 2 is a system 200 of a preferred embodiment that comprises an end office identification information to destination number selector 205, a first database location 210, a second database location 220, a zip code selector 230, a database location selector 240, and a destination number selector 250. The first and second database locations 210, 220 are each associated with a respective plurality of destination numbers. The end office/destination number selector 205, zip code selector 230, database location selector 240, and destination number selector 250 can each comprise computer usable medium having computer readable program code embodied therein. It is important to note that “media” is intended to broadly cover any suitable media, analog or digital, now in use or developed in the future. The end office/destination number selector 205, zip code selector 230, database location selector 240, and destination number selector 250 can be separate components, or, alternatively, their functionality can be combined and/or distributed.

FIG. 3 is a flow chart of a preferred method using the system shown in FIG. 2. First, the dialed number is received from a calling party (step 310). Next, it is determined whether information identifying the end office of the calling party is available and if there is only one destination number associated with the calling party's end office (step 320). If information identifying the end office of the calling party is available and if there is only one destination number associated with the calling party's end office, the end office/destination number selector 205 selects a destination number based on the end office identification information (step 330). If information identifying the end office of the calling party is not available or if there is more than one destination number associated with the calling party's end office, the zip code selector 230 determines the zip code associated with the calling party (step 340). With the determined zip code, the database location selector 240 determines which database location 210, 220 to query for the appropriate destination number (step 350). It is preferred that the database location selector 240 make this determination independent of the dialed number. After the appropriate database location is selected, the destination number selector 250 queries the selected database location using the calling party's zip code to determine the destination number that the calling party should be routed to (step 360).

FIG. 4 is a block diagram of a system 400 of another preferred embodiment, which uses Advanced Intelligent Network (“AIN”) architecture. As shown in FIG. 4, this system 400 comprises a first and second service switching point (“SSP”) end office 410, 420, a first and second signal transfer point (“STP”) 415, 417, a service control point (“SCP”) 430, and a database 440. The system 400 also comprises a tandem office 450 coupled with non-AIN components such as an independent teleco end office 460, an interlata exchange carrier 470, a cellular carrier 480, and a non-SSP end office 490. As used herein, the term “coupled with” means directly coupled with or indirectly coupled with through one or more components. The AIN components of the system 400 communicate voice and data traffic and network signaling protocols that control switching of the voice and data traffic. An SSP is an end office equipped with AIN software, which enables the SSP to suspend call processing and launch a query to an SCP. An SCP can handle queries sent from the SSP by communicating with a database. An SSP is characterized by identifying information (such as an address or an originating point code), and the database 440 correlates the SSP identifying information with one of a plurality of destination numbers. As is known in the art, an originating point code is a message that can be included in a Signaling System 7 (“SS7”) message that is sent to an SCP to inform it where to send a query response.

It is preferred that the database 440 comprise a section 502 that correlates end office identification information (e.g., originating point code) with a destination number. It is also preferred that the database 440 comprise first and second database locations 515, 520 each associated with a respective plurality of destination numbers, as shown in FIG. 5. The database 440 also comprises a section 505 that correlates calling party numbers with zip codes associated with the calling party numbers and a section 510 that correlates zip codes with either the first or second database locations 515, 520. For simplicity, the terms “section” and “database location” are intended to broadly cover any storage area that comprises the correlation information. Although the first and second database locations 515, 520 and the SCP 430 are shown as separate components, it is important to note that each can be combined with one another or distributed to other storage locations in the network. Further, any SCP can be programmed with a table containing the information described above.

FIG. 6 is a flow chart showing the operation of the AIN system 400 of FIG. 4. First, the first SSP end office 410 receives a dialed number from a calling party (step 605). Next, it is determined whether the first SSP end office 410 has a trigger (preferably, a 3/6/10 Digit or N11 PODP trigger) set responsive to the dialed number (step 610). If the office does not have a trigger set, the call is routed to a host office (step 615). For example, if the calling party is associated with a non-AIN component such as an independent teleco end office 460, an inter-exchange carrier 470, a cellular. carrier 480, or a non-SSP end office 490, the call can be routed to the tandem office 450.

For illustration purposes, assume that the calling party is associated with the first SSP end office 410. The first SSP end office 410 then sends a query (preferably, an Info_Analyzed query including a CallingPartyID parameter) to the SCP 430 (step 620). If the originating point code is available, the SCP 430 queries the end office/destination number section 502 of the database 440 to determine the appropriate destination number (step 622). The SCP 430 returns a response to the first SSP end office 410 (step 660), and the call is routed to the appropriate destination number (step 670). If the originating point code is unavailable or if the SCP 430 determines that there is more than one destination number associated with the originating point code, the SCP 430 uses the calling party number to determine the zip code associated with the calling number (step 630). As described above, the database 440 can contain this correlation information, or, alternatively, the SCP 430 can be programmed with a table containing this information. With the calling party's zip code, the SCP 430 queries the database 440 to determine which database location 515, 520 to query to determine the destination number (step 640). Then, using the calling party's zip code, the SCP 430 queries the selected database location to retrieve the routing information (step 650) and sends an appropriate response message (preferably, an Analyze_Route message) to the first SSP end office 410 (step 660). Then, the first SSP end office 410 routes the call to the destination requested by the SCP 430 (step 670). Here, the destination number is associated with the second SSP end office 420.

It is important to note that although the preceding example illustrated a preferred system and method that used both end office identification information and calling party's zip code, a method and system using either end office identification information or calling party's zip code alone can be used to determine a destination number.

The following is an example that illustrates the methods and systems described above. In this example, a calling party dials a single number (here, “311”) and is directed to a non-emergency center of the community associated with the calling party for handling non-emergency access to police and/or other community departments. It is important to note that the methods and systems described above can be used for any application and that this example is merely one application. This example is not meant to limit the claims in any way. Turning again to the drawings, FIG. 7 shows a first and second database location 515, 520 in the database 440. The first database location 515 correlates the nine-digit zip codes in the 60614 zip code area with destination numbers of non-emergency centers that service residents in the 60614 area. The second database location 520 contains similar information for the 60657 area.

For this example, assume that the 60614 and 60657 zip codes are each serviced by a respective end office. Since there are multiple destination numbers associated with each end office, it is preferred that the embodiments using the calling party's zip code be used. If there were only one destination number associated with an end office and if end office identification information (e.g., an originating point code) were available, it would be preferred to use the embodiments that identify the destination number using the end office identification information.

Turning back to the example, assume a calling party is dialing 311 from a location in the 60657.0003 area. After received the digits 311, the first SSP end office 410 can send a query including a CallingPartyID parameter to the SCP 430. Using the CallingPartyID parameter, the SCP 430 determines that the calling number is associated with the zip code 60657-0003. Using the calling party's zip code (preferably, all nine digits), the SCP 430 queries the database 440 to determine which database location 515, 520 to search. In this example, the second database location 520 contains the correlation information relevant to the 60657 area. Again using the calling party's zip code (preferably, all nine digits), the SCP 430 queries the second database location 520 and returns the destination number of DN23 to the SSP 410. Finally, the SSP 410 routes the call to DN23, which is the non-emergency service center closest to the calling party.

There are several alternatives to the preferred embodiment discussed above. First, the calling party number may not always be sent by the SSP to the SCP. For example, the CallingPartyID may not be available in the query message when calls are routed through non-SS7 trunks or when a calling party uses a cellular telephone. In these situations, the SCP can send the SSP a command (preferably, a Send_to_Resource message) for an interactive announcement with the calling party. The SSP can play an announcement to the calling party requesting that the calling party depress the digits of his phone number. These digits are then sent to the SCP (preferably, in the form of a Resource_Clear message), and the above-described steps can be performed. If the SSP cannot play the announcement and collect the digits, the call can be routed to a host office that has such capabilities. If the calling party number is not sent to the SCP by the SSP and if the play-and-collect alternative described above is not available, the SCP can return a default destination number (preferably through a “default DN” message in the Analyze Route response message), and the SSP can route the call to that number. The default number can route to a non-emergency service center or to a central office announcement. Alternatively, the call can be routed a tandem (host) office, and the query can be resent.

If the database 440 is incomplete and does not contain the necessary correlation information (e.g., if the database 440 does not contain a destination location for the queried zip code or if a public branch exchange sends seven digits and the database 440 is configured to be responsive to ten digits), the office originating code can be used to determine routing information rather than merely routing the call to a default location. In another alternative, if the database 440 is incomplete, the caller can be asked to depress the digits of his phone number, as described above. The collected telephone number can then be used to access an independent table in the SCP 430, which correlates specified NPA-NXX numbers with associated destination numbers. In this way, calls from cellular phones, independent companies, and telecommunications carriers whose numbers are not in the database 440 can be routed. Additionally, instead of being asked to enter his telephone number, the caller can be asked to enter the community from which he is calling. This can occur through an announcement asking the caller to depress a specified key for a specific conmmunity, which can be used to then select the appropriate destination number.

In another alternative embodiment, the routing of a call can be determined by the time the call is placed. For example, a call can be routed to a particular non-emergency service center during certain hours of the day and be routed to an alternate or default location if the call is placed outside a specified time frame. Additionally, reports can be generated for the operators of the telecommunication network to aide in troubleshooting (e.g., how many times a call was routed to a default location or lack of correlation information). Reports can also be generated for the non-emergency service centers for statistical analysis. It is preferred that the calling party number be excluded from these reports for those calls in which the calling party activated Caller ID blocking and for those calls associated with lines having per-line blocking. It is further preferred that the calling party's number not be displayed to the non-emergency service center when the calling party has activated Caller ID blocking and for those calls associated with lines having per line blocking. It is important to note that multiple destination numbers can be associated with multiple customers or multiple service locations of a single customer. This should be recognized when assigning default numbers and when generating reports.

It is preferred that in the AIN implementation described above, the SSPs be at least partially provisioned with AIN 0.1 functionality, possess N11 or /3/6/10 digit Trigger capability, and be able to send an “Info Analyzed” query and “Resource Clear” response message to the SCP. Additionally, the SSP and SCP are preferably programmed to enact Automatic Code GAP (“ACG”) controls if the SCP detects an overload condition and requests the SSP to do so via a multiple-component message including the ACG request message. It is also preferred that SS7 trunks and SS7 ISUP protocol be used between the originating and the host end offices. Additionally, it is preferred that SS7 Transaction Capabilities Applications Protocol (“TCAP”) messaging be used between the SSP and the SCP.

It is intended that the foregoing detailed description be understood as an illustration of selected forms that the invention can take and not as a definition of the invention. It is only the following claims, including all equivalents, that are intended to define the scope of this invention. 

1. A method for routing a call to a common number corresponding to a plurality of users, the method comprising: receiving the common number at an end office associated with a calling party, the end office having unique identification information; correlating the unique identification information to a destination number associated with one of the plurality of users; and routing the call to the destination number.
 2. The method for routing the call to the common number according to claim 1, in which the unique identification number of the end office comprises one of an end office address and an originating point code.
 3. The method for routing the call to the common number according to claim 1, in which the common dialed number comprises a three digit number.
 4. The method for routing the call to the common number according to claim 3, in which the three digit number comprises one of 311 and
 911. 5. The method for routing the call to the common number according to claim 4, in which each of the plurality of users comprises a municipality.
 6. A method for routing a call from a calling party to a common number corresponding to a plurality of users, the method comprising: receiving the common number at an end office associated with the calling party, the end office having unique identification information; determining whether the unique identification information is associated with more than one user of the plurality of users; and when the unique identification information is associated with only one user of the plurality of users, correlating the unique identification information to a destination number associated with the one user and routing the call to the destination number.
 7. The method for routing the call from the calling party to the common number according to claim 6, further comprising; when the unique identification information is associated with more than one user, associating a zip code with the calling party, correlating the zip code to a destination number associated with one of the plurality of users and routing the call to the destination number.
 8. The method for routing the call from the calling party to the common number according to claim 7, in which the unique identification number of the end office comprises one of an end office address and an originating point code.
 9. The method for routing the call from the calling party to the common number according to claim 1, in which the common dialed number comprises fewer than seven digits.
 10. A computer readable medium storing a computer program for routing a call number to a common number corresponding to a plurality of users, the common number being received at an originating end office associated with the calling party number, the computer readable medium comprising: a correlating code segment that correlates unique identification information associated with the originating end office to a destination number associated with one of the plurality of users; and a routing code segment that controls routing the call to the destination number.
 11. The computer readable medium according to claim 10, further comprising: a zip code determining code segment that determines a zip code associated with the calling party; and a zip code correlating code segment that correlates the determined zip code to a destination number associated with one of the plurality of users when multiple destination numbers, associated with multiple users, are correlated to the unique identification information by the correlating code segment.
 12. The computer readable medium according to claim 10, further comprising: a zip code determining code segment that determines a zip code associated with the calling party; and a zip code correlating code segment that correlates the determined zip code to a destination number associated with one of the plurality of users when the unique identification information is not available to the correlating code segment.
 13. The computer readable medium according to claim 10, in which the unique identification number of the end office comprises one of an end office address and an originating point code.
 14. The computer readable medium according to claim 10, in which the common dialed number comprises a three digit number.
 15. A system for routing a call from a calling party number to a common number corresponding to a plurality of users, the system comprising: an end office that receives the common number from the calling party number, the end office having unique identification information; a service control point that receives a first query from the end office, the first query including the calling party number, the service control point determining whether the unique identification information is available; and a database that receives a second query from the service control point, the second query including the unique identification information when the unique identification information is available, the database determining whether the unique identification number is associated with one destination number; wherein, when the unique identification number is associated with one destination number, the database correlates the unique identification information to the one destination number and provides the destination number to the service control point for call routing.
 16. The system for routing the call from the calling party to the common number according to claim 15, wherein, when the unique identification information is not available, the service control point determines a zip code associated with the calling party number, the second query including the zip code; and wherein the database correlates the zip code with a destination number associated with one of the plurality of users and provides the destination number to the service control point for routing the call.
 17. The system for routing the call from the calling party to the common number according to claim 15, wherein the service control point determines a zip code associated with the calling party number, the second query including the zip code; and wherein, when the unique identification number is associated with more than one destination number, the database correlates the zip code with a destination number associated with one of the plurality of users and provides the destination number to the service control point for routing the call.
 18. The system for routing the call from the calling party to the common number according to claim 16, in which the database comprises: a first database location, associated with at least a portion of a first zip code and a first plurality of destination numbers; and a second database location, associated with at least a portion of a second zip code and a second plurality of destination numbers; wherein the database queries one of the first database location and the second database location based on the zip code associated with the calling party number; and wherein the queried one of the first database location and the second database location correlates the zip code with the destination number.
 19. The system for routing the call from the calling party to the common number according to claim 18, wherein the zip code comprises a nine digit zip code; and wherein the portion of the first zip code, with which the first database location is associated, comprises the first five digits of the first zip code and the portion of the second zip code, with which the second database location is associated, comprises the first five digits of the second zip code.
 20. The system for routing the call from the calling party to the common number according to claim 17, in which the database comprises: a first database location, associated with at least a portion of a first zip code and a first plurality of destination numbers; and a second database location, associated with at least a portion of a second zip code and a second plurality of destination numbers; wherein the database queries one of the first database location and the second database location based on the zip code associated with the calling party number; and wherein the queried one of the first database location and the second database location correlates the zip code with the destination number.
 21. The system for routing the call from the calling party to the common number according to claim 20, wherein the zip code comprises a nine digit zip code; and wherein the portion of the first zip code, with which the first database location is associated, comprises the first five digits of the first zip code and the portion of the second zip code, with which the second database location is associated, comprises the first five digits of the second zip code. 